Design a three layer flexible pavement system using the CBR method, knowing hat the present AADT is (6500 v/d) the heavy vehicles represent 25% of it. The ighway lifetime and the construction period about 18 years and the growth rate s (r30.02). The CBR values are as foll ows: Subgrade soil = 6%, sub-base = 7%, Base = 75%. %3D %3D

Design a three layer flexible pavement system using the CBR method, knowing hat the present AADT is (6500 v/d) the heavy vehicles represent 25% of it. The ighway lifetime and the construction period about 18 years and the growth rate s (r30.02). The CBR values are as foll ows: Subgrade soil = 6%, sub-base = 7%, Base = 75%. %3D %3D

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Concept explainers

Design of pavements

Pavement is a structure that is made up of different layers such as sub-base course layer, base course layer, binder course, and a surface course formed with different materials such as gravel, above the subgrade soil constructed to act as a path or carriageway enabling the movement of vehicles. The surface of the pavement should possess characteristics such as adequate friction, light reflection, and drainage. The pavements are classified based on structural design into rigid pavements, flexible pavements, composite pavements, and unpaved pavements. The process of determining a suitable pavement type, its constituent layers, and its thickness is called pavement design.

Question

A) Design a three layer flexible pavement system using the Vheem method,
knowing that the projected ESAL is (32.000,000), the R value for the cement
treated granular base (Type B) is 75, for the subbase is 55 and for the subgrade
soil is 29.
B) Design a three layer flexible pavement system using the CBR method, knowing
that the present AADT is (6500 v/d) the heavy vehicles represent 25% of it. The
highway lifetime and the construction period about 18 years and the growth rate
is (r-0.02). The CBR values are as follows: Subgrade soil = 6%, sub-base =
17%, Base = 75%.
%3!

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A flexible pavement is designed to last 10 years to withstand truck traffic that consists only of trucks with two 18-kip single axles. The pavement is designed for a soil CBR of 10, an initial PSI of 5.0, a TSI of 2.5, an overall standard deviation of 0.40 and a reliability of 90%, and the structural number was determined to be 6. Determine the number of daily trucks traveling in the peak direction. 150,814 B 75,407 C) 37,704 18,852
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